Ni Hao Feng, First of all, please do not include an complete daily digest in a question (or reply) on this or any user list. If required, cut out only that part which connects to your question or reply.
Then, in addition to Bobs comments, you can also use the terminal or a script, using the command: set sphere_scale, 0.3 (or another value) This will do what it says and scale your atoms sphere radius with the factor given. Another possibility is to assign a different atomic radius to your atom: alter e. s, vdw=newradius_float_argument maybe like: alter e. s, vdw=vdw*0.9 Note that you may have to "rebuild" your scene, if you were already using a sphere representation. Best, Tsjerk -- Tsjerk A. Wassenaar, Ph.D. Junior UD (post-doc) Biomolecular NMR, Bijvoet Center Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands P: +31-30-2539931 F: +31-30-2537623
