The method of control of duration of intensive molecular beam pulses is suggested. The method is based on shortening of initial molecular beam pulse by formation of a pressure shock in front of a solid surface. through which the molecular beam passes. The experimental results on shortening of molecular beam pulses are presented. Using suggested method the molecular beams of H-2, He, SF6 and SF6/H-2(1/10), SF6/He(1/10) with duration of pulses less than or equal to 10 mus were obtained, the extent of which in space are less than or equal to 1-2 cm. (C) 2002 Elsevier Science B.V. All rights reserved.