A home-made sol-gel-derived poly（methylphenylvinylsiloxane）（PMPVS）/ hydroxy-terminated silicone oil（OH-TSO） solid-phase microextraction fiber coupled to gas chromatography（GC）/nitrogen-phosphorus detection（NPD） was firstly developed to determine organophosphorus pesticides（OPPs: dichlorvos

diazinon

methyl parathion

malathion and ethyl parathion） in celery cabbage samples.The following parameters effecting on the headspace solid-phase microextraction（HS-SPME） extraction efficiency were optimized.The detection limits of the method varied from 1.01 to 2.56 ng/g

and the relative standard deviations（n=5） for these pesticides were found to be from 3.5% to 9.9%.The linearity range was two orders of magnitude.Compared with commercial SPME stationary phases

this fiber shows better selectivity and sensitivity towards these pesticides.For celery cabbage samples from market

the recoveries of five OPPs were 80.2%

90.3%

85.4%

81.9% and 91.8%

respectively.