In order to further improve the technological level of domestic erasable pen color paste, a wide temperature range color changing paste with large delay capability was developed. Using crystal violet lactone (CVL) as leucochroma, bisphenol AF(BPAF) as chromogenic agent and 4-benzoxy phenyl ethyl caprate (DPE) as solid solvent, the most suitable core material ratio for erasable inks was m(CVL): m(BPAF): m(DPE)=1:2:50, so that the core material achromatic temperature is greater than 55 ℃ and has a good color-changing lag ability. Using urea-formaldehyde resin as the wall material, the core material was microencapsulated by in-situ polymerization, and the emulsifier concentration, emulsifying stirring speed and time during the microencapsulated process were studied. The microcapsules with particle size ranging from 500 nm to 1300 nm were obtained at 8% emulsifier concentration and a stirring speed of 10,000 rpm for 1 h. The coating rate was 82.4%, the achromatic temperature of the paste was 55~60 ℃, and the color developing temperature was -15~-20 ℃. The color properties of the prepared paste are good, and the erasability meets the requirements of use.