Dissolved the samples by methanol, with diethyl phthalate as internal standard, the content of diniconazole is separated and determined by means of Liquid Chromatography under high pressure on the ODS column and ultraviolet detector. This method has advantages of good accuracy and precision. The results show that after ten times of repeated measuration with the same specimen of diniconazole, the standard deviation is 0.37, the alteration index is 0.38% and the recovery coefficient is in the range of 98.9% t...