The GTS1 type radiosonde has been used in the radiosonede sounding network of the China Meteorological Administration for 10 years, and its technology has become lagged, so technical improvements are urgently needed. On the basis of the original technical structure, in September 2010, the test of the improved radiosonde was carried out at Yangjiang Station, and in December 2011, the test of temperature radiation correction algorithm to improve was conducted at the same place. The results show that the temperature from the improved radiosonde at night has a deviation of about 01 ℃, and no more than 03 ℃ in daytime. The measured pressure is smaller than that from the RS92 radiosonde, whose accuracy is better than the GTS1 radiosonde. The humidity sensor is responsive, and the measured results have good consistency with those from RS92 The bias between them is basically less than 5%.