Objective To investigate the correlation between liver-type fatty acid binding protein (L-FABP) and nonalcoholic fatty liver disease (NAFLD) extent and other clinical parameters.Methods Ninety-six patients of NAFLD (NAFLD group) and 100 cases of healthy controls (control group) were selected.The levels of serum L-FABP and blood biochemical parameters were measured by enzyme-linked immunosorbent assay.The lesion degree was assessed by ultrasound.The body mass index (BMI),waist to hip ratio (WHR) and homeostasis model assessment insulin resistance index (HOMA-IR) were calculated.Results The WHR,BMI,fasting plasma glucose (FBG),triglycerides (TG),alanine aminotransferase (ALT),HOMA-IR and L-FABP in NAFLD group were higher than those in control group,there were statistical differences (P ＜ 0.05).The result of correlation analysis showed L-FABP level was positively related with ALT,TG,FBG,WHR,BMI,HOMA-IR (r =0.735,0.728,0.681,0.713,0.699,0.673 ;P ＜0.05),and negative correlation with HDL-C (r =-0.607,P ＜ 0.05).The L-FABP level in control group was (15.42 ± 2.51) g/L,mild NAFLD was (15.96 ± 2.92) g/L,moderate NAFLD was (17.48 ± 3.91) g/L,serious NAFLD was (25.14 ± 5.37) g/L.There was statistical difference in L-FABP level between serious NAFLD and control group,mild NAFLD,moderate NAFLD (P ＜ 0.05).Conclusion Serum L-FABP level of serious NAFLD patient significantly increases,and L-FABP level is related with biochemical parameters of liver function.