diff --git a/src/apis/createDiary.jsx b/src/apis/createDiary.jsx
new file mode 100644
index 0000000..2d25250
--- /dev/null
+++ b/src/apis/createDiary.jsx
@@ -0,0 +1,26 @@
+import axios from "axios";
+
+const createDiary = async (formDataToSend, csrfToken, goalId) => {
+  console.log("API 코드에서 잘 넘어왔는지", formDataToSend, csrfToken, goalId);
+  try {
+    const serverResponse = await axios.post(
+      `${process.env.REACT_APP_HOST_URL}/v1/goals/${goalId}/journals`,
+      formDataToSend,
+      {
+        withCredentials: true,
+        headers: {
+          "Content-Type": "application/json",
+          "X-CSRF-TOKEN": csrfToken,
+        },
+      }
+    );
+    console.log("일지가 정상적으로 추가되었음", serverResponse);
+
+    return serverResponse.data;
+  } catch (error) {
+    console.error("일지 추가 실패:", error);
+    throw error;
+  }
+};
+
+export default createDiary;
diff --git a/src/diaryListPage/components/CreateDiaryModal.jsx b/src/diaryListPage/components/CreateDiaryModal.jsx
index 5d349bb..66fec10 100644
--- a/src/diaryListPage/components/CreateDiaryModal.jsx
+++ b/src/diaryListPage/components/CreateDiaryModal.jsx
@@ -2,7 +2,7 @@ import React from "react";
 import { useNavigate } from "react-router-dom";
 import styled from "styled-components";
 import CloseRoundedIcon from "@mui/icons-material/CloseRounded";
-function CreateDiaryModal({ setIsModalOpen }) {
+function CreateDiaryModal({ setIsModalOpen, goalId }) {
   const navigate = useNavigate();
 
   const closeCreateDiaryModal = () => {
@@ -25,27 +25,17 @@ function CreateDiaryModal({ setIsModalOpen }) {
               <TextContainer>
                 <MainText>👾 (봇이름)이와 함께 일지 작성하기</MainText>
                 <SubText>
-                  <div>
-                    무슨 일지를 써야할지 고민이 되는 날에도, 고된 일정으로
-                    피곤한 하루에도
-                  </div>{" "}
-                  <div style={{ marginTop: "3px" }}>
-                    (봇이름)이가 chicky님의 꾸준한 기록을 도와줄게요!
-                  </div>
+                  <div>무슨 일지를 써야할지 고민이 되는 날에도, 고된 일정으로 피곤한 하루에도</div>{" "}
+                  <div style={{ marginTop: "3px" }}>(봇이름)이가 chicky님의 꾸준한 기록을 도와줄게요!</div>
                 </SubText>
               </TextContainer>
             </WriteMethod>
-            <WriteMethod onClick={() => navigate("/write")}>
+            <WriteMethod onClick={() => navigate(`/write?id=${goalId}`)}>
               <TextContainer>
                 <MainText>✍️ 직접 작성하기</MainText>
                 <SubText>
-                  <div>
-                    오늘만큼은 적고 싶은게 너무 많은 날, 떠오르는 생각과 느낌을
-                    적고 싶은 날
-                  </div>
-                  <div style={{ marginTop: "3px" }}>
-                    자유롭게 하루의 일지를 적어보아요!
-                  </div>
+                  <div>오늘만큼은 적고 싶은게 너무 많은 날, 떠오르는 생각과 느낌을 적고 싶은 날</div>
+                  <div style={{ marginTop: "3px" }}>자유롭게 하루의 일지를 적어보아요!</div>
                 </SubText>
               </TextContainer>
             </WriteMethod>
diff --git a/src/diaryListPage/components/Diaries.jsx b/src/diaryListPage/components/Diaries.jsx
index 2ffc62b..65c6421 100644
--- a/src/diaryListPage/components/Diaries.jsx
+++ b/src/diaryListPage/components/Diaries.jsx
@@ -39,13 +39,9 @@ function Diaries() {
     let diaries = goalList.journals;
 
     if (currentSort === "최신순") {
-      diaries = diaries.sort(
-        (a, b) => new Date(b.createdDate) - new Date(a.createdDate)
-      );
+      diaries = diaries.sort((a, b) => new Date(b.createdDate) - new Date(a.createdDate));
     } else if (currentSort === "오래된 순") {
-      diaries = diaries.sort(
-        (a, b) => new Date(a.createdDate) - new Date(b.createdDate)
-      );
+      diaries = diaries.sort((a, b) => new Date(a.createdDate) - new Date(b.createdDate));
     }
 
     return diaries;
@@ -64,20 +60,14 @@ function Diaries() {
     <ListPart>
       <Searchbar>
         <SearchIcon />
-        <input
-          className="search-bar"
-          placeholder="제목+내용을 입력해보세요."
-        ></input>
+        <input className="search-bar" placeholder="제목+내용을 입력해보세요."></input>
       </Searchbar>
       <DairyListBox>
         <div className="diary-list-head">
           <div onClick={openCreateDiaryModal} className="diary-add">
             일지 추가하기 <img src={goPencil} alt="" />
           </div>
-          <DiaryViewDropdown
-            currentSort={currentSort}
-            setCurrentSort={setCurrentSort}
-          />
+          <DiaryViewDropdown currentSort={currentSort} setCurrentSort={setCurrentSort} />
         </div>
         <DiaryList>
           {filteredDiaries.map((diaries, index) => (
@@ -89,15 +79,13 @@ function Diaries() {
                 </div>
               </div>
               {diaries.thumbnail ? ( // 이미지url이 있는지 없는지 판별, 있으면 Image 컴포넌트 보여주고 없으면 안넣음
-                <Image
-                  style={{ backgroundImage: `url(${diaries.thumbnail})` }}
-                />
+                <Image style={{ backgroundImage: `url(${diaries.thumbnail})` }} />
               ) : null}
             </Diary>
           ))}
         </DiaryList>
       </DairyListBox>
-      {isModalOpen && <CreateDiaryModal setIsModalOpen={setIsModalOpen} />}
+      {isModalOpen && <CreateDiaryModal setIsModalOpen={setIsModalOpen} goalId={goalId} />}
     </ListPart>
   );
 }
diff --git a/src/diaryWritePage/components/DiaryPostModal.jsx b/src/diaryWritePage/components/DiaryPostModal.jsx
index 6267845..823e9ba 100644
--- a/src/diaryWritePage/components/DiaryPostModal.jsx
+++ b/src/diaryWritePage/components/DiaryPostModal.jsx
@@ -2,11 +2,11 @@ import React from "react";
 import styled from "styled-components";
 import fire from "../../asset/emoji/fire.png";
 import { useNavigate } from "react-router-dom";
-function DiaryPostModal({ setPostedModal }) {
+function DiaryPostModal({ setPostedModal, goalId }) {
   const navigate = useNavigate();
   const closeModal = () => {
     setPostedModal(false);
-    navigate("/homepage"); // !!!! 중요, 나중에 연결할때 이 부분이 diaryList?id= 링크로 연결되어야함.
+    navigate(`/diaryList?id=${goalId}`); // !!!! 중요, 나중에 연결할때 이 부분이 diaryList?id= 링크로 연결되어야함.
   };
 
   return (
diff --git a/src/diaryWritePage/components/DiaryWrite.jsx b/src/diaryWritePage/components/DiaryWrite.jsx
index c35e2d9..ae43d9f 100644
--- a/src/diaryWritePage/components/DiaryWrite.jsx
+++ b/src/diaryWritePage/components/DiaryWrite.jsx
@@ -5,6 +5,7 @@ import ThumbnailModal from "./ThumbnailModal";
 import DiaryPostModal from "./DiaryPostModal";
 import { useRecoilValue } from "recoil";
 import { tokenState } from "../../atom/atom";
+import { useLocation } from "react-router-dom";
 function DiaryWrite() {
   const [thumbnailModal, setThumbnailModal] = useState(false); // 썸네일 사진 추가하는 모달
   const [postedModal, setPostedModal] = useState(false); //일지가 추가되었다는 걸 알려주는 모달
@@ -13,6 +14,9 @@ function DiaryWrite() {
     content: "",
   });
   const csrfToken = useRecoilValue(tokenState);
+  const location = useLocation();
+  const queryParams = new URLSearchParams(location.search);
+  const goalId = queryParams.get("id");
 
   const openThumbnailModal = () => {
     setThumbnailModal(true);
@@ -60,11 +64,12 @@ function DiaryWrite() {
           <ThumbnailModal
             setThumbnailModal={setThumbnailModal}
             setPostedModal={setPostedModal}
+            formData={formData}
+            goalId={goalId}
+            csrfToken={csrfToken}
           />
         )}
-        {!thumbnailModal && postedModal && (
-          <DiaryPostModal setPostedModal={setPostedModal} />
-        )}
+        {!thumbnailModal && postedModal && <DiaryPostModal setPostedModal={setPostedModal} goalId={goalId} />}
       </BoxWrapper>
     </Wrapper>
   );
diff --git a/src/diaryWritePage/components/ThumbnailModal.jsx b/src/diaryWritePage/components/ThumbnailModal.jsx
index 8832809..671b3e7 100644
--- a/src/diaryWritePage/components/ThumbnailModal.jsx
+++ b/src/diaryWritePage/components/ThumbnailModal.jsx
@@ -2,7 +2,8 @@ import React, { useEffect, useRef, useState } from "react";
 import styled from "styled-components";
 import CloseRoundedIcon from "@mui/icons-material/CloseRounded";
 import AddRoundedIcon from "@mui/icons-material/AddRounded";
-function ThumbnailModal({ setThumbnailModal, setPostedModal }) {
+import createDiary from "../../apis/createDiary";
+function ThumbnailModal({ setThumbnailModal, setPostedModal, formData, goalId, csrfToken }) {
   // 이미지 설정//
   const fileInputRef = useRef(null);
   const [previewUrl, setPreviewUrl] = useState(null); // 미리보기창에 들어갈 이미지 url
@@ -15,13 +16,28 @@ function ThumbnailModal({ setThumbnailModal, setPostedModal }) {
   const handleImageUploadClick = () => {
     fileInputRef.current.click();
   };
-  const handleNextStep = () => {
+  const handleNextStep = async () => {
     // 대표사진 선택하기 모달에서 "다음으로" 버튼 누르고 나면 사진선택 모달은 숨기고 그 이후 모달(일지 추가 완료 모달)을 보여줘야함.
     // *** 이 함수 안에서 일지를 백엔드로 submit해야할듯 (내용 + 대표사진) *** //
     // 일단 임시로 "다음으로"버튼 누르면 그 다음 모달로 넘어가는 것만 해둠.
-
-    setThumbnailModal(false);
-    setPostedModal(true);
+    // 아직 이미지는 보내는거 연결안했는데 백엔드 구현되면 수정해야함
+    try {
+      const { title, content } = formData;
+
+      const formDataToSend = new FormData();
+      formDataToSend.append("title", title);
+      formDataToSend.append("content", content);
+
+      // 이미지 파일이 존재할 경우에만 추가
+      if (fileInputRef.current.files[0]) {
+        formDataToSend.append("image", fileInputRef.current.files[0]);
+      }
+      await createDiary(formDataToSend, csrfToken, goalId);
+      setThumbnailModal(false);
+      setPostedModal(true);
+    } catch (error) {
+      console.error("일지 생성 실패", error);
+    }
   };
   const handleFileInputChange = (event) => {
     const file = event.target.files[0];
@@ -67,12 +83,7 @@ function ThumbnailModal({ setThumbnailModal, setPostedModal }) {
                 <div className="image-add-text">사진 추가하기</div>
               </>
             )}
-            <input
-              type="file"
-              style={{ display: "none" }}
-              onChange={handleFileInputChange}
-              ref={fileInputRef}
-            />
+            <input type="file" style={{ display: "none" }} onChange={handleFileInputChange} ref={fileInputRef} />
           </ImageAdd>
           <Buttons>
             <NextBtn>