Data bases of reversed field pinch (RFP) plasma have been gradually accumulated by recent experiments of several RFP devices. New confinement scalings τ
X(X=RFP
s1)
E=0.024Aa
2I
P/P
1/2heat, τ
X(X=RFP
s2)
E=0.04s(I
N)Aa
2I
1.25P/P
1/2heat which are consistent to the recent data are presented, where units are in [s], [m], [MA] and [MW] respectively and s(I
N) is a correction function of I
N≡I
P/πa
2‹n
e›
20). From the standpoint of new scalings, dependences among parameters of possible RFP reactors are analyzed to find the conditions for RFP reactors. H
s1 H
s2 are defined by the ratios of necessary energy confinement time for RFP reactors for burning against τ
X(X=RFP
s1) and τ
X(X=RFP
s2) respectively. When confinement time follows τ
X(X=RFP
s1)
E scaling, confinement enhancement factor of at least H
s1=23 is necessary for RFP reactors to be realistic. When confinement time follows τ
X(X=RFP
s2)
E scaling, data points in I
P-a space of RFP reactors are within the region of target.
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