Abstract: Delaying-crosslinking polymer gel is a general system for profile control in deep sector in abroad and home, and delaying-crosslinking agent is the important component of delaying crosslingking system.According to investigated material abroad and home, an efficient delaying-crosslinking agent have been developed, which adjust PAM forming gel time from 1~15d, and concentration is below 0.2%, cost is low and preparation on site is simple, and crosslinking sy stem shows basicity, not corrosing transportation tools and injection equipments. Synthesizing course for efficient delaying-crosslinking agent is especially described, and mechanism for efficient delaying-crosslinking and application performance for crosslinker are demonstrated with details.