A modified gas chromatography technology was developed to detect suckercide residues of dlibutalin, flumetralin and pendimethalin with a series of good agricultural practice (GAP) samples at planting stage, and during the storage process and smoking process in tobacco leaf. The results showed that the standard curve, the quantitative limit and the recoveries conformed to the requirements of the pesticide residue detection method. The half-life of pendimethalin, butralin and flumetralin in fresh leaf was 2.15~5.89 days, 5.17~12.2 days, 3.26~5.16 days, respectively, and in the cured tobacco leaf in storage process was 173~495 days, 192~462 days, 216~533 days, with the characteristic of the higher original concentration and the longer half-life. In the process of combustion and absorption, the migration rate of suckercides from tobacco leaf to main stream smoke was 8.52 %~14.58 %, 16.73 %~21.04 %, 13.30 %~13.71 %, with the higher transfer rate in the lower concentration. Moreover, at the recommended dose of rational application of suckercide in tobacco planting, the suckercide residues are lower than GRLs of CORESTA. Standardising the rational application and lengthening the safety interval are the key measures to control the suckercide residues.