Abstract: “Numerous time series analysis method has been introduced. Metocean forces are known as the most challenging factors in designing stage of offshore structure. Environmental loads are also known as the basic design of any primary structure of offshore platforms. Cross-spectral analysis enables two parameters to be analyzed simultaneously. In this research, a cross-spectral analysis of two environmental loads which are wind speed and wave height, will be analyzed simultaneously. Cross-spectral density is defined as the Fourier Transform of the corresponding cross-correlation function. Cross-correlation is a measure of similarityof these two waveforms as a function of a time-lag applied to one of them. In time series analysis, the cross-spectrum is used as part of frequency domain analysis of the cross-correlation between two time series.Cross-spectral analysis is also known as an extension of spectral analysis. Spectral analysis is described as a representation of a time series or mathema”

Keywords: metocean, cross-spectral, spectral, offshore structures, coherence