The invention relates to a structure for controlling discoloration for an electrochromic lens and a method therefore. Primarily, it is provided with an electrochromic lens, and a positive power supply terminal and a negative power supply terminal are disposed on two sides and the upper or lower ends of the electrochromic lens. A positive power supply and a negative power supply are connected to the matched positive and negative power supply terminals on the two sides and upper or lower ends of the electrochromic lens respectively. The positive and negative power supply terminals are connected and conducted with an electrochromic area of the electrochromic lens. Accordingly, the current conduction area can be increased when the positive and negative power supplies input power simultaneously by means of the arrangement that the positive and negative power supply terminals are disposed on the two sides and upper or lower ends of the electrochromic lens respectively. Thus the color conversion rate of the electrochromic area of the electrochromic lens can be increased, so as to increase the practicability and efficiency for the whole implementation.