Abstract: Propellant fracturing for long interval has been urgent problem in High Energy Gas Fracturing （HEGF） filed. A long interval pulse exploding fracturing technology called PFGun can stimulate long interval up to 180 m on one run ,remove blockage around wellbore for improving production or injection . Technical principle, systemic structure, technical parameters of PFGun system and a successful field application N2-4-D 48 well were introduced . Pressure profile （p-t curve） was recorded during deflagration event using downhole P-T instrument, inner diameter（ID） of casing was tested using 40-arm caliper and cementation coefficient of cement ring were tested using eight radial sector bond tool before and after operation. The treatment results illustrated that N2-4-D 48 well in Daqing increased in production from 9.6 t/d to 22 t/d, changes of casing inner diameter was not more than 5 mm, the largest decline of the cement cementation coefficient 0.03, data above met safety requirements of field application. It is proved that PFGun system should be utilized further because of its significant results on stimulating production and process safety.