According to the postal code database, the first two digits 40 represent Chongqing, the third digit 1 represents Chongqing postal area, the fourth digit 5 represents Hechuan District, and the last two digits 20 represent specific delivery areas.

Chongqing technology and business university Pais College, located in Hechuan District, Chongqing, is a full-time independent undergraduate course college approved by the Ministry of Education. It is an ordinary undergraduate college of finance and economics with the right to award bachelor's degrees.