Ultracold plasma is a modern physical object for investigation. This is nonequilibrium plasma, created by method of laser cooling and laser ionization. Electron temperature in the plasma is K Te = 0,1 ÷100 K . Time of existence is several microseconds. The recombination processes in the ultracold plasma are intensity slow down. Our calculations predict creation of structure like in solid or liquid state in defined parameters. We show method of creation and diagnostics in ultracold plasma.