1. According to the structural feature of parallel single disk gate valve, the strength and rigidity of body will be calculated with finite element method, and with cylindroid shell theory.

2. Remain its accuracy by rotating 360 degree around its axle center for Square and cylindroid vials .

3. Based on the thermal guide theory, we analyzed the melting progress with the cylindroid model in the optical fiber LPHVD (laser plasma hybrid vapour deposition) process.

4. Remain its accuracy rotating 360 degree around center for Square and cylindroid vials.

5. This paper propose the analytical solve of effective factor of one-dimensional cylindroid catalyst, which takes an one-order inreversible reaction, by using special functions.