diff --git a/lib/drivers/include/plic.h b/lib/drivers/include/plic.h
index 2cc42fb..ec56ee2 100644
--- a/lib/drivers/include/plic.h
+++ b/lib/drivers/include/plic.h
@@ -358,6 +358,15 @@ extern volatile plic_t *const plic;
  */
 typedef int (*plic_irq_callback_t)(void *ctx);
 
+/**
+ * @brief       Definitions for IRQ table instance
+ */
+typedef struct _plic_instance_t
+{
+    plic_irq_callback_t callback;
+    void *ctx;
+} plic_instance_t;
+
 /**
  * @brief       Initialize PLIC external interrupt
  *
@@ -467,11 +476,13 @@ void plic_irq_deregister(plic_irq_t irq);
 void plic_irq_unregister(plic_irq_t irq);
 
 /**
- * @brief       Get IRQ table
+ * @brief       Get IRQ table, Usage:
+ *              plic_instance_t (*plic_instance)[IRQN_MAX] = plic_get_instance();
+ *              ... plic_instance[x][y] ...;
  *
  * @return      the point of IRQ table
  */
-plic_instance_t * plic_get_instance(void);
+plic_instance_t (*plic_get_instance(void))[IRQN_MAX];
 
 /* For c++ compatibility */
 #ifdef __cplusplus
diff --git a/lib/drivers/plic.c b/lib/drivers/plic.c
index e436ce6..5fc1231 100644
--- a/lib/drivers/plic.c
+++ b/lib/drivers/plic.c
@@ -21,12 +21,6 @@
 
 volatile plic_t* const plic = (volatile plic_t*)PLIC_BASE_ADDR;
 
-typedef struct _plic_instance_t
-{
-    plic_irq_callback_t callback;
-    void *ctx;
-} plic_instance_t;
-
 static plic_instance_t plic_instance[PLIC_NUM_CORES][IRQN_MAX];
 
 void plic_init(void)
@@ -161,7 +155,7 @@ void plic_irq_unregister(plic_irq_t irq)
 
 void __attribute__((weak, alias("plic_irq_unregister"))) plic_irq_deregister(plic_irq_t irq);
 
-plic_instance_t * plic_get_instance(void)
+plic_instance_t (*plic_get_instance(void))[IRQN_MAX]
 {
     return plic_instance;
 }