After analyzing a part plaied by each components of critical temperature resistor（CTR）

studying corresponding resistauce-temperature characteristic curve of the measurement results of three samples

and comparing electric conduction characteristic of different parts

the appropriate proportion has been known

that is

when CTR is manufactured

V

2

O

5

∶P

2

O

5

∶Fe

2

O

3

=3∶1∶1.The relationship of each part of components when they’re interacting is also been known.The quantity of P

2

O

5

affects the stability of VO

2

crystallite and also affects the valence of Fe

2

O

3

and it’s electronic conduction.The quantity of Fe

2

O

3

affects the conductor performance of VO

2

when T>T

C

and it affects the average electric conductivity of the CTR when T

<

T

C

.