diff --git a/add-support-for-loongarch64.patch b/add-support-for-loongarch64.patch
new file mode 100644
index 0000000000000000000000000000000000000000..6fa0f3470407f498003fa28bad1c9d200d57ec9f
--- /dev/null
+++ b/add-support-for-loongarch64.patch
@@ -0,0 +1,20 @@
+diff -uNr cfitsio-4.3.0/fitsio2.h cfitsio-4.3.0-new/fitsio2.h
+--- cfitsio-4.3.0/fitsio2.h	2023-07-21 22:37:17.000000000 +0800
++++ cfitsio-4.3.0-new/fitsio2.h	2025-10-16 19:15:39.303867826 +0800
+@@ -120,6 +120,16 @@
+ #  endif
+ #  define LONGSIZE 64
+ 
++#elif defined(__loongarch__)
++#define BYTESWAPPED TRUE
++#  if __loongarch_grlen == 32
++#    define LONGSIZE 32
++#  elif __loongarch_grlen == 64
++#    define LONGSIZE 64
++#  else
++#    error "can't handle long size given by __loongarch_grlen"
++#  endif
++
+ #elif defined(_MIPS_SZLONG)
+ 
+ #  if defined(MIPSEL)
diff --git a/cfitsio.spec b/cfitsio.spec
index ef0f39f7ffd670c3a57164ac1ce9cc7b66a22a0d..965d4f516849c6d2bf1cb9fcb314d6fe06ee7a67 100644
--- a/cfitsio.spec
+++ b/cfitsio.spec
@@ -1,4 +1,4 @@
-%define anolis_release 1
+%define anolis_release 2
 
 Name: cfitsio
 Version: 4.3.0
@@ -12,6 +12,7 @@ Patch1: cfitsio-noversioncheck.patch
 Patch2: cfitsio-pkgconfig.patch
 Patch3: cfitsio-ldflags.patch
 Patch4: cfitsio-remove-rpath.patch
+Patch5: add-support-for-loongarch64.patch
 
 BuildRequires: gcc-gfortran
 BuildRequires: make
@@ -123,6 +124,9 @@ chmod 755 %{buildroot}%{_bindir}/f{,un}pack
 %{_bindir}/funpack
 
 %changelog
+* Thu Oct 16 2025 wuhao <wuhao01@loongson.cn> - 4.3.0-2
+- Add support for loongarch64
+
 * Thu Jul 27 2023 Funda Wang <fundawang@yeah.net> - 4.3.0-1
 - New version 4.3.0