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We present a detailed analysis of the soft X-ray emission of 3C445 using anarchival Chandra HETG spectrum. Highly-ionized H- and He-like Mg, Si and Slines, as well as a resolved low-ionized Si K$\alpha$ line, are detected in thehigh resolution spectrum.  The He-like triplets of Mg and Si are resolved into individual lines, and thecalculated R ratios indicate a high density for the emitter. The low values ofthe G ratios indicate the lines originate from collisionally ionized plasmas.However, the detection of a resolved narrow Ne X RRC feature in the spectrumseems to prefer to a photoionized environment. The spectrum is subsequentlymodelled with a photoionization model, and the results are compared with thatof a collisional model. Through a detailed analysis on the spectrum, we excludea collisional origin for these emission lines. A one-component photoionizationmodel provides a great fit to the emission features.  The best-fit parameters are log$\xi$ = $3.3^{+0.4}_{-0.3}$ erg cm s$^{-1}$,$n_{H}$ = $5^{+15}_{-4.5}\times10^{10}$ cm$^{-3}$ and $N_{H}$ =$2.5^{+3.8}_{-1.7}\times10^{20}$ cm$^{-2}$.  According to the calculated high density for the emitter, the measuredvelocity widths of the emission lines and the inferred the radial distance (6$\times$ $10^{14}$ - 8 $\times$ $10^{15}$ cm), we suggest the emission linesoriginating from matter locate in the broad line region (BLR).

Analysis of the 3C445 Soft X-ray Spectrum as Observed by Chandra high-energy gratings