Temperature of 87Rb atoms can be cooled below Doppler cooling limit by using the decompressed magneto-optical trap (DCMOT) technique. Cold atoms of 87Rb are trapped in magneto-optical trap (MOT), and the temperature of cold atoms is further lowered by decreasing the magnetic field gradient and repumping light power, increasing the detuning of cooling light. The optimal experimental parameters are obtained by investigating the relationship between atomic density after free flight and the magnetic field gradient, power of repumping light and detuning of cooling light. The atom temperature measured after DCMOT is 129 μK, which is lower than Doppler cooling limit temperature of 87Rb atom (144 μK). The low temperature cold atoms are loaded directly into the magnetic trap with a loading efficiency of 25%.